OP says the offending company is quasi governmental aerospace. Sounds like a defense contractor.

There will be a security officer at such a company. If I was that officer, I would be profoundly unhappy that employees, whose job (by the nature of the company) regularly takes them into classified waters, were freely giving their personal gmails to a third party overseas. I mean, you just broadened the attack surface on the employees by tying them to their presence in the Google ecosystem. Yikes.